. Key to North American birds; containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary . uit of active flyinginsects. A little practice in field ornithology will enalile one to recognize theflycatchers from their habit of perching in wait for their prey upon some prominentoutpost, in a peculiar attitude, with the wings and tail drooped and vibrating inreadiness for instant action ; and of dasliing into the air, seizing the passing insectwith a quick movement and a click of the bill, and then ret
. Key to North American birds; containing a concise account of every species of living and fossil bird at present known from the continent north of the Mexican and United States boundary . uit of active flyinginsects. A little practice in field ornithology will enalile one to recognize theflycatchers from their habit of perching in wait for their prey upon some prominentoutpost, in a peculiar attitude, with the wings and tail drooped and vibrating inreadiness for instant action ; and of dasliing into the air, seizing the passing insectwith a quick movement and a click of the bill, and then returning to their some Oscines have somewhat the same habits, these pursue insects fromplace to place, instead of perching in wait at a particular spot, and their forays arenot made with such admirable elan. Dependent entirely upon insect food, thespecies are necessarily migratory in our latitudes ; thej appear with great regularityin spring, and depart on the first approach of cold weather in the fall. They aredistributed over temperate Nortii America; many of them are common birds of theEastern States. The voice, susceptible of little modulation, is usually harsh and. , FLYCATCHERS.—GEN. 104, 105. 169 strident, though some species have a not unpleasant whistle or twitter. The sexesare not ordinarily distinguishable (Iemarliable exception in gen. Ill), and thechanges of plumage with age and season are not very great. The larger kinds areunmistakable, but several of the smaller species (of gen. 107, 108, 109) look verymuch alike, and their discrimination becomes a matter of much tact and diligence. 104. Genus MILVULUS Swainson. *5K* Adults with the tail much longer than the body, deeply forficate, one or moreouter primaries strongly emarginate, and a brightly colored crown-patch. Fovk-tailed Three or four primaries emargiuate; crowu-patch yellow. Clear ash, below white ; top and sides of head, and tail, black ;the onter tail feather white
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